Thermostat.



PATBNTED AUG. 6, 1907.

H. H. PILGHER.

THERMOSTAT.

APPLIOATION FILED APB, 26,1906.

l "Y mi ATTUR/VEYS HERBERT H. PILCHER, OF MULLINS, TENNESSEE.

THERMOSTAT.

To all whom 'it may concem:

Be it known that I, HERBERT H. kPILCHER, a citizen o'f the United States, residing at Mullins, in the countyof Shelby and State of Tennessee, have inventeda new and lusefulImprove'rxie'nt in a Thermostat, of which the following is a specification. i

This invention relates to a `thermostat especially` designed for the purpose of regulating lthe size of the llame in liquid fuel burners employed in generating steam or in connection with super-heaters, thereby holding the 4temperature oi the steam at the desired point.

-The invention consists of inclosing' withina perforated tube which tube is exposed to the steam, a thermostatic bar, which bar is brought into direct contact with the steam by reason of the steam passing through the perforlat'ions of the tube. vCertain fuel controlling means are actuated by the thermostatic In the drawings forminga part of this specification Figure 1 a detail perspective view of the device. Fig. 2 is a vertical section therethrough. Fig. 3 is a section on the line 3 3 of Fig. 2. Fig.v 4 is a section on the line 4-4 of Fig. 2.

In these drawings A represents a supply pipe through which a liquid fuel enters a suitablecasing B. This casing B .is provided with an outlet -B thoughwhich the fuel is discharged on its wa'y to any suitable burner.

Infthe end of the casingopposite the discharge B is threaded a sleeve C, closed at its outer end. A needle valve C has one end slidably held in the sleeve C *whilev its opposite tapered end is adapted to close the discharge opening, and by its position relative' to s'aid opening vcontrols the'amountof fuel passing to the burner.

A coil spring D is carried by the needle valve C and bears at one end upon the slee v C and at the other end i upon a 'suitable stop D the tendency 'of this spring being to normally closethe discharge opening by forel ing the needle valve C to its seat. The upper portion of the `casing B is concaved, theconcavity being centrally provided with an opening B2 which communicates with the `interior ofthe casing B. Upon the casing B is secured a conical casing Efand inthe chamvprevents the vescape of steam into the casing B, but also serves as a tension device as will hereafter appear.

' Aperorated tube G yhas it's lower end threadeddntd the casing E, and is closed by asuit-ableplugH at its Spe-cication of Letters Patent.

Appntation alsa ps1 28.1906. serial No. 314,262.

Patented Aug. 6, 1907.

passes through the diaphragm F, which is. tightly secured to the bar,and the bar also extends downwardly through the opening B2, into the Acasing 'B and is p`ro vided near its lowerend with a pin H2. An angled lever .l is pivoted within the casing B and the angled or hook end o'f the lever .T is adapted to be normally in engagement with the pin H2, while the other end of .the lever .l is normally in engagement with the stop D.

The action of the device is as follows I-Steam circulating'through the tube G will come-into, direct contact with the copper bar H and'while this bar will normally hold the lever .T in such a position that the needlevalve will be forced farther into the sleeve C opening the discharge, as shown in Figs. 2 and 4, as the temperature of the bar H -rises it will lengthen by reason of its expansion and the downward movement of the pin H'2 will permit the lower end oi the lever J to swing toward the discharge opening and thereby permit .the needle valve C to close more or less the said opening, thereby regulating the amount of fluid passing from Vthe casing., Should the temperature drop below the desired point, the contraction of the bar H will .l slightly upward and swinging the 'lower end toward the sleeve C opening the discharge outlet and increasing the flow of fuel to the burner.

lIt will be obvious that the diaphragm F will not only prevent steam from passing into the casing B but having steam pressure upon its upper side, it will act as a tension for the bar H.

Having thus fully described my invention, what lclaim tube, a thermostntic bar secured at the end' of the tube opposite the diaphragm and passing through the tube, and through the diaphragm said bar being secured to the diaphragm, and means carried by thefree end portion of the bar adapted to nctuute fuel controlling mechanism.

2. A device of the kind described comprising a casing, means for admitting and discharging .a liquid fuel from said casing, n spring pressed valve controlling the 'discharge of fuel from the casing, n second casing mounted upon the rst mentioned casing, a chamber being formed between the two casings, va diaphragm arranged .in said chamber and held between the twocasings, a perforated tube having one end secured in the second mentioned casing and opening into the-said chamber, n thermostatic'bar ing also through the diaphragm the diaphragm being secured to the bar and having steam pressure above it, and

la lever adapted to be actuated by the bar and engaging with the said valve, as and for the purpose set forth.

' HERBERT H. PILCHER. Witnesses:

Ron'r. VENCE, T. W. WILSON.

lift the pin H2 thus drawing the hook end of the lever tight diaphragm arranged n'djacent'the said end' of the secured in the tube und extending therethrough and pass- 

